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electronic tacho #703654
08/02/17 2:43 am
08/02/17 2:43 am
Joined: Nov 2010
Posts: 23
south australia
A
Auzray Offline OP
BritBike Forum member
Auzray  Offline OP
BritBike Forum member
A
Joined: Nov 2010
Posts: 23
south australia
HI all
I am interested in fitting A Speedhut legacy tacho to my 59 super rocket. These from the makers say they can be fitted to Most gasoline engines and do not require a sender, and can hook up to a coil
However can they pick up the signal from the HT lead on the twin , they do say not to splice onto the HT lead as will damage the tacho. But I have seen reference on cheaper tachos that you can wrap a signal /pulse wire around a HT lead to get a reasonably accurate signal to the tacho,
Anybody done this ?, if so what brand was used and how did it work? The Speedhut tacho is small enough to possibly fit in a Smith case, and can have the Bezel screwed off to remove needle and overlay with a matching dial. :)Yes I know its not original but I have the wrong oil pump and don't have the correct tacho which I believe is a reverse 3/1 I also don't want to run a cable off the magneto, as I will have to drill through cover and tap ,plus change mag drive etc
I would appreciate any info from anybody that has had a go at fitting any electronic tacho to there magneto bikes
thanks Ray

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Re: electronic tacho [Re: Auzray] #703656
08/02/17 3:12 am
08/02/17 3:12 am
Joined: Aug 2001
Posts: 4,465
Owego, NY, USA
Mark Z Offline
BritBike Forum member
Mark Z  Offline
BritBike Forum member
Joined: Aug 2001
Posts: 4,465
Owego, NY, USA
I purchased a Speedhut tach for my A65. It's no longer working (I'll get to that), but it does not pick up from the HT lead, it connects to the primary (12V) coil. I'm not sure how this would work with a mag. Also, it needs 12 volts for power - are not A10s 6-volt?

I had two problems with this gauge, one of which was fixable and one not. When wired through the keyswitch, it was picking up noise from the ignition circuit on the power wire and giving erratic readings, so I had to run dedicated power wires to the battery (switched and fused, of course). The other problem is that the gauge is apparently very sensitive to voltage spikes and dips, which render the gauge unusable. The first time this happened, I returned the gauge and the Speedhut techs "reprogrammed" the guage and supposedly installed a chip to protect against voltage spikes. The second time it happened, I emailed Speedhut, and stated that I knew it was out of warranty and that I would pay for another repair if it's repairable. They did not respond to my email.

These gauges are not specifically made for motorcycles and apparently expect the larger battery and better regulated charging system of an automobile (or a late model motorcycle). I'm sure Smith's have taken this into consideration, but they're too pricey for my blood, so I'm now looking at GPS speedometers, which are starting to become available in analog-looking (round with a needle) displays.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.

Moderated by  Alan_nc 


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